Albert zo



(No Model.)

A. Z QBEL. BLEGTRIGLAMP.

No.-511,22 9. Patented Dec. 19, 1893.

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THE NATIONAL u moaRAFmNa war-MY.

UNITED STATES PATENT OFFICE.

ALBERT ZOBEL, OF MUNICH, GERMANY.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 511,229, dated December19, 1893.

Application filed February 15,1893. Serlalllo. 462,520, (No model.)

To aid whom it may concern:

Be it known that l, ALBERT ZOBEL, a subject of the King ofl/Viirtemberg, residing at Munich, Bavaria, in the Empire of Germany,have invented certain new and useful Improvements in Electric Lamps, ofwhich the following is a specification.

The present invention relates to incandescent electric lamps and itsobject is to so arrange each lamp that a burned out or otherwise injuredfilament will be at once replaced by another filament without furthermanipulation.

The object is also to make the lamp capa ble of an enhancedincandescence.

It is the object of this invention, furthermore, to produce the aboveresults without making any appreciable changes on the lamp or its globe.

For this purpose my invention, which may be applied to the globes of allthe existing incandescent systems, consists in the means,

features and combination of parts hereinafter described and pointed outin the claims.

In the drawings accompanying this specification-Figure 1 represents aside elevation of an incandescent lamp with two filaments; Fig. 2 avertical central section through the lamp socket; Fig. 3 a diagramillustrating the arrangement when the lamps are connected in parallel;and Figs. 4:, 5 and G sectional views of a modified form of lamp.

As already stated, the incandescent or glowlamps, under my invention,are provided with two or more filaments in such a manner that they maybe successively thrown into circuit. For a. two-filament glow-lamp threeconducting wires,1, 2 and 3, are arranged in the lamp socket. Two ofthese (1 and 2) are connected with the filament, d, in the usual manner.The wire, 2,m0reover, as well as the platinum wire, 3, is connected.with the second filament, b. The third connecting wire, 3, projects fromthe lamp and is insulated by the gypsum of the socket. (See 4, in Fig.1.)

Referring now to Fig. 3 and assuming that the filament a, is in circuit,it will be noted that the current passes from the main conductor, I,through the wire, III, to the socket thence to wire, 2, through thefilament, a, through the platinum wire, 1, to the second part of thesocket thence passing out to the main conducting wire, II. If, however,the filament, a, is burned out or broken, then the third conductingwire, 3, is soldered onto the contact-plate, IV, of the socket asindicated in Fig. 3 in dotted lines. The current now passes from theconductor, 1, through connecting wire, III, to the platinum wire, 2,through the filament, b, and the conducting wire, 3, back to the mainconductor, II. The filament, b, will hence be rendered incandescent. Thethird platinum wire may also be secured to the contact-plate of thesocket when it is desired to enhance the incandescence of the glow-lamp.This causes both filaments to glow and the lighting power of the lampwill now amount to thirty-two candle power if it was sixteen with thesingle filament.

Figs. 4, 5 and 6 show one form of carrying my invention into eifect. Inthis construction the conducting wires 2 and 3, only are fused into thebase of the glass globe. These two conducting wires are connected by acarbon filament, b, in the interior of the globe in the usual manner. Atsome distance from the two wires, 2 and 3, athird wire, 1, is fused intothe glass base of the lamp globe, in such a manner that it projects onlyinto the interior and extends only to about one-half of the thickness ofthe glass base, so that the perfect hermetic sealing of the lamp globewill not be interfered with. This wire, 1, is connected with one of theconnecting wires, for example 2, by a filament, (1,. Awire projectingtothe exterior, as .in the first construction, represented in Fig. 1, isentirely omitted in this construction, and the substitute filament ishere thrown into circuit in a different manner, as described below.A-loose contact device within the lamp bulb, which may be in the form ofa plate, as shown at d, in Fig. 4, or a hook, as shown at cl, at Fig. 5,or a fork, c, Fig. 6, is arranged on the wire, 3, which, for thispurpose, may be provided with a double bend (Fig. 4), or a ring (Fig.5).

In the first case, that. is, where a contact plate, d, is employed, thethird wire is preferably provided with a small piece of spring wire, c,(Fig. 4.) The contact-plate, cl, is of metal and is suspended on thewire, 3, by a perforation, through which the said wire passes; The edgeof the plate is provided with notches.

Ordinarily, thefilament, b, is employed, the current passing throughwire, 2-, through the filament, b, to the conducting wire, 3. When,however, the second filament, a, is to be thrown into circuit, the lampis reversed and so shaken or manipulated that the contactplate, d, iswedged in between the wires, 3 and 0. (See full lines in Fig. 4.) Inthis manner an electric connection is established between the wires, 3and c, and therefore also between the conducting wires, 2 and 3, throughthe filament, a. The position of the-metal plate, cl, is assured by thenotches provided in its edge. If, now, a current is carried through thelamp in its changed condition both fialments are causedto glow if thefilament, b, is intact, the current entering at 2, and being distributedover-the two filaments, b and a, from the first of whichpasses directlyto the wire 3, while from the latter filament, a, it reaches'the wire,3, only after it has passed through the wires, 1, c and-thecontact-plate, d. If, however, the filament, b, is broken or burned outthe current'passes only through the latter circuit.

In the modification shown in Fig. 5, a small hook, d, of conductingmaterial is substituted for the contact-plate (Z. Similarly totheplate', cl, the hook, d, is arranged so as to be'easily' movable onthe wire, 3, and adapted to engage the wire, 1, by a suitable reversaland manipulation of the glowdamp. In Fig. 6, the samepurposeisaccomplished bya wire, e, split at its end and attached to theconducting wire, 3. This forked wire, 6, is bent in such a manner thatits forked end will snugly fit against the wire,1, and thus estab lish'the connection between the wires, 1 and 3, by a blow suitably impartedto the lamp.

What I claim, and desire to secure by Let- I ters'Patent, is-

1. In an electric glow lamp, the combin'ation, with a lamp socket, of apair of conduct- 3 tion, with a lamp socket, of a pair of conductingwires extending through the lamp socket, a third conducting Wireinserted in the socket and projecting into thelamp, a filamentconnecting the pair'of conducting wires, asecond filament connecting thesecond wire of the pair with the third wire, and a loose contact devicewithin the lamp bulb and arranged to connect the third wire'with thesecond wire of the pair, substantially as set forth.

3. In an electric glow lamp, the-com-bination, with a lamp socket, ot'apair of conductin g wires extending through the lamp socket, a thirdconducting wire inserted inthe socket and projecting into the lamp, afilament connecting the-pairof conducting wires,- a second filamentconnecting the second wire-of the pair with the third'wire, and a loosecontact plate suspended from the secondwire located Within the lampbulb, and arranged tobe brought into contact with the second wire of thepair, substantially as set'fort-h.

In testimony that I claim the foregoing as my invention I have signedmy-namein presence of two subscribing witnesses.

AIIBERT ZOBEL.

Witnesses: I V

ALBERT WEICKMANN, O. MAYER.

